Francis h



(No Model.)

P. H. EASBY.

MECHANISM FOR PRODUCING INTERMITTING MOTION.

No. 436,755. Patented Sept. 16, 1890,.

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UNITED STATES PATENT OFFICE.

FRANCIS H. EASBY, OF XVILMINGTON, DELAWVARE, ASSIGNOR OF ONE-THIRD TOTHE BETTS MACHINE COMPANY, OF SAME PLACE.

MECHANISM FOR PRODUCING INTERMITTING MOTION.

SPECIFICATION forming part of Letters Patent No. 436,755, datedSeptember 16, 1890.

Application filed June 7,1890. Serial No. 354,570- (No model.)

.To all whom it may concern:

Be it known that I, FRANCIS H. EAsBY, of WVilmington, Delaware, haveinvented a new and useful Mechanism forProducing Intermitting Motion, ofwhich the following description and claims constitute the specification,and which is illustrated by the accompanying sheet of drawings.

This invention consists in a peculiar mechanism for producing anintermitting motion by means of a clutching-surface and a clutchingdevice, either of which may be the driver and the other the driven, andthe clutchingsurface and the clutching device being so arranged thatthey are engaged or disengaged by means of mechanism hereinafterdescribed, and that when so engaged motion is transmitted from one tothe other until disengagement occurs.

This invention is applicable, with some changes in constructive detail,to produce intermitting motion from a variety of drivers as, forexample, where the motion of the driver is rotary and continues in onedirection, or where the motion of the driver is rectilinear andcontinues in one direction, or where the motion of the driver isrotaryand alternating in opposite directions, or where the motion of thedriver is rectilinear and alternating in opposite directions, and in anysuch case the driven may be moved intermittingly in the direction of thedriver, and the clutching-surface and the clutching device may beoperated by similar mechanism, either automatically or by hand; but themost commonly-occurring case is where the motion of the driver is rotaryand alternating in opposite directions, and the accompanying drawingsshow the application of the invention to such a case.

Figure 1 is a central vertical section of the apparatus. Fig. 2 is avertical section looking to the left from the line a b of Fig. 1. Fig. 3is a plan view of what is shown in Fig. 1 minus the disk at theright-hand end of that figure. Figs. 4 and 5 are views of each of twocounterpart pawls, hereinafter described.

The letter A indicates the stationary case inclosing the apparatus andfixed to the frame of the machine to which the apparatus is applied,while the letter 13 indicates a cover, which is fixed to the casing A bybolts or otherwise. The bevel-wheel O is keyed to the shaft D, and isprovided with the annular flange-like clutching-surface E, and theinterior of that clutching-surface is composed of a series ofalternating projections e a and recesses e b, as shown in Fig. 2. Thering F is loosely fitted in an annular recess on the face of thebevel-gear O inside of the annular clutching-surface E, and this ring isprovided with two diametrically-opposite radial slots G and H for thereception of the pins I of the pawls J and K. One of those pawls ispivoted to each end of the slide L, adjacent to one of the inwardprojections of that slide, and that slide is pivoted, not far from itsmiddle, to one end of the lever M. The other end of that slide isprovided with the double stud N for engagement with the cam-track O inthe block P, and that block is provided with the stud Q for engagementwith the inclined sides of the cam-track R, which is cut in the upperside of the cover B. The slide L, the lever M, and the block P and theirappurtenances are all carried by the shaft S, and that shaft turns in abearing in the cover B on an axis coincident inline with the axis of theshaft D. The shaft S may be provided .with the disk T for transmittingits intermittent motion to other mechanism; but that disk is not a partof the present invention.

The function of the invention, as shown in the drawings, is to give ashort intermittent rocking motion in opposite directions to the shaft Sby means of rotary motion, alternating in opposite directions, of theshaft D. In performing that function the mode of operation is asfollows: The shaft D is caused, by means not shown in the drawings, torevolve and to carry the bevel-gear O with it in the direction indicatedby the arrow in Fig. 2. After a number of revolutions the direction ofrevolution of the shaft D and bevel-gear O is reversed, and thatreversal causes a corresponding movementof the ring F, and that ring, bymeans of the engagement of its slot H with the stud I of the pawl J,raises the point of that pawl into the position shown in Fig. 2. Thepoint of that pawl soon engages with the adjacent projection of theclutchingsurface E, and that projection forces the pawl J and the slideL and the shaft S to revolve with the shaft D until the stud Q reachesand rides upon the outer inclined side of the camtrack R; but when thatoccurs the stud Q is forced inwardly by that side of that cam-track, andcarries with it the block P. The camtrack 0 in the block P operates uponthe stud N to raise the outer end of the lever M and to depress theinner end thereof and thus to depress the slide L. That depressioncarries the pawl J out of contact with the clutchingsurface E withoutcarrying the pawl K into contact with that clutching-surface. Thus therevolution which was communicated to the shaft S from the shaft D isdiscontinued, and the shaft S remains stationary until the direction ofthe revolution of the shaft D is again reversed and turned in thedirection of the arrow in Fig. 2. l/Vhen that event occurs the ring F ismade to participate in that motion and to carry the point of the pawl Kinto engagement with the clutching-surface E by means of the slot G inthe ring F and the stud I on the pawl K. That engagement causes the pawlK, the slide L, and the shaft S to revolve with the shaft D until thestud Q reaches and rides upon the inner inclined side of the cam-trackB. When that occurs, the stud Q and the block P are forced outwardlyagain to their positions shown in Fig. 1, and thus operate to depressthe outer end of the lever M and to raise its inner end, and to raisealso the slide L. That raising disengages the pawl K from theclutching-surface E without engaging the pawl J therewith. Thus themovement of the shaft S is stopped, and remains so until the nextreversal of the direction of the revolution of the shaft D causesanother engagement of the pawl J with the clutching-surface E. Thus ashort rocking motion is given to the shaft S at the beginning of eachreversal in direction of the revolutions of the shaft D, and the lengthof that rocking motion is limited by the length of the cam-track R, andthat length may be made adjustable by making theinclined sides of thatcam-track in the form of separate and adjustable blocks or in the formof adj ustv able stops.

The friction between the ring F and therecess in which ity is placed issufficient to turn the pawls J and K upon their pivots upon the ends ofthe slide L, but is not sufficient to move the slide L and the shaft Sand the other parts appurtenant to that shaft; and the friction-ring Falso serves to hold the pawls J and K out of contact with theclutching-surface E when the shaft D is revolving and the shaft S isstationary, and thus serves to obviate the noise which might otherwisebe caused by contact between that clutchingsurface and those pawls.

The clutching-surface shown in the drawings is in the form of a ratchetflange or wheel, and the clutching devices are pawls; but other devicesknown to skilled mechanics can be used in their places, andfrictionclutches are examples thereof. The mechanism shown in thedrawings to move the slide L consists of a system of cams; but thatmechanism can be replaced by a system of stops and levers or otherdevices of like character known to skilled mechanics.

I do not confine myself to constructive details in the parts of myinvention; but

I claim as my invention 1. The described devices to obtain intermittingmotion, consisting of a clutching-surface and clutching device combinedwith an intermittingly-shifting slide and a lever, substantially as setforth.

2. The combination of the shaft D, alternately revolving in oppositedirections, the shaft S, intermittinglyrocked thereby in oppositedirections at the beginnings of those alternations, and theintermediatemechanism, substantially as described, for connecting and disconnectingthe two shafts, all substantially as described.

3. The combination of the shaft D, the clutching-surface E, carried bythat shaft, the shaft S, and the slide L, carried by that shaft andprovided with the pawls J and K for engagement and disengagement withthat clutching-surface, all substantially as described.

4. The combination of the shaft D, the clutchingsurface E,-carried bythat shaft, the friction-ring F, the shaft S, and the slide L, carriedby that shaft and provided with the paw ls J and K for engagement withthat clutching-surface and with that ring, all substantially asdescribed.

5. The combination of the shaft S, the slide L, the lever M, the blockP, provided with the cam-track O and the stud Q, and the cover 13,provided with the cam-track R, all substantially as described.

6. The combination of the slide L, the pawls J and K, and the ring F,all substantially as described.

7. The combination of the shaft D, the clutching-surface E, the ring F,the pawls J and K, the slide L, the lever M, and the block P, allsubstantially as described.

FRANCIS H. EASBY.

Witnesses:

ALFRED Burrs, EDWARD T. Burrs.

